Rotary pump



C. P. WATEROUS.

ROTARY PUMP.

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DmUZ UNITED STATES PATENT OFFICE.

CHARLES P. WATEROUS, OF ST. PAUL, MINNESOTA, ASSIGNOR TO WATIJROUSENGINE WORKS COMPANY, OF ST. PAUL, MINNESOTA, A CORPORATION OFMINNESOTA.

ROTARY PUMP.

Specification of Letters Patent.

Patented Dec. 7, 1920.

Application filed April 19, 1916. Serial No. 92,264.

To all whom it may concern:

Be it known that 1, CHARLES P. VVATEnoUs, citizen of the United States,resident of St. Paul, county of Ramsey, State of Minnesota, haveinvented certain new and useful Improvements in Rotary Pumps, of whichthe following is a specification.

The object of my invention is to provide a pump of the rotary typecapable of general use but particularly adapted for fire enginepurposes.

A further object is to provide a pump of extremely simple and durableconstruction and one which is conveniently accessible for examination orrepairs.

A further object is to provide a pump which will maintain a uniformstreamof water in the hose connections.

Other objects of the invention will appear from the following detaileddescription.

The invention consists generally in various constructions andcombinations, all as hereinafter described'and particularly pointed outin the claims. 1

In the accompanying drawings forming part of this specification, I

Figure l is a view, partially in section, of a rotary pump embodying myinvention,

Fig. 2 is a vertical sectional view of the same, i

Fig. 3 is a detail sectional view, showing a portion of the reservoirand piston chambers,

Fig. 4 is a horizontal sectional view through the cylinder, showing theoblique arrangement of the cutoff,

Fig. 5 is a transverse sectional view through the reservoir andcylinder, also showing the cutofi arrangement.

In the drawing, 2 represents the side rails of the truck frame, composedpreferably of channel bar for strength and rigidity. 3 represents thecasing of the pump cylinder having passages 4; formed thereincommunicating on each side of the truck with the hose connections 5, thecylinder being supported on the rails 2 by bolts 6. 7 is a reser voirhaving hydrant connections at 8 and communicating through a throat 9with the piston chamber 10. ()n the opposite side of this chamber fromthe throat 9 is a smaller discharge opening 11 leading from the pistonchamber to the passages 4. Through this opening 11 the water is forcedby the pistons to the hose connections.

12 is a shaft, having a driving connection with the source of power (notshown) and on this shaft a piston 13 is secured. A shaft 14 is geared at15 to the shaft 12 and is provided with a piston 16. The piston chamberis elliptical in form, having parallel heads, as shown in Fig. 1, whilethe pistons are flattened and provided with curved faces 17 and arepositioned so that, as they revolve, the end of one will contact withthe middle portion of the other one and close the passage between them.

The arrangement of the pistons is shown in Fig. 2, where the piston 13is shown in contact with the upper wall of the piston chamber while apocket is formed between it and the end wall of the chamber, which isfilled with water and carried along as the piston revolves to the outletopening. The other piston revolving in the opposite direction has movedto a point where it is lengthwise of the chamber and the water pocket isalready in communication with the outlet opening, the pistonsalternating in operation to balance the stroke of the pump. Suitablepacking 18 is mounted in the ends of the pistons. The piston chamber hasa cutofl 19 on each side of the inlet opening 9 and adjacent thereto.These cutoffs, onefor each piston, are so disposed on the walls of thepiston chamber that they extend obliquely to the direction of travel ofthe pistons and provide for a gradual cutoff and eliminatethe shock-orjar usually incidental to an instantaneous cutofi or one where thepiston is revolved past a shoulder at right angles to the direction oftravel.

I have found from actual test that the oblique arrangement of thesecutofi' abutments insures a smooth, non-jarring action of the pistonsand greatly reduces the vibration of the pump. I regard this cutoff inconnection with each piston as an important feature of the invention.

1 have also found it of considerable importance to have the reservoir of'ater close to the passages so that a constant supply is maintainedadjacent to the piston chamber.

In various ways the details of construction herein shown and describedmay be modified and still be within the scope of my inven* tion.

I claim as my invention:

' 1. rotary pump comprising a housing, a piston chamber formed thereinhaving water intake and discharge openings, the walls of said pistonchamber having abutments formed obliquely thereon and operating ascutofi's in said chamber, and pistons mounted to revolve in said chamberand having ends for. contacting with the walls of said chamber and withsaid cutofl's, the diagonal arrangement of said abutments roviding agradual cutofi' adjacent said inet opening.

2. A rotary pump comprising a housin havin a piston chamber formedtherein an provi ed with intake and exhaust openings,

.In witness whereof, I have hereunto set my hand this 14 day of April,1916.

CHARLES P. WATEROUS.

